derive_state_machine_future 0.2.0

# Contributing to `state_machine_future`

Hi! We'd love to have your contributions! If you want help or mentorship, reach
out to us in a GitHub issue, or ping `fitzgen` in
[`#rust` on irc.mozilla.org](irc://irc.mozilla.org#rust) and introduce yourself.

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- [Code of Conduct](#code-of-conduct)
- [Building](#building)
- [Testing](#testing)
- [Automatic code formatting](#automatic-code-formatting)

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## Code of Conduct

We abide by the [Rust Code of Conduct][coc] and ask that you do as well.

[coc]: https://www.rust-lang.org/en-US/conduct.html

## Building

```
$ cargo build
```

## Testing

To run all the tests:

```
$ cargo test
```

## Automatic code formatting

We use [`rustfmt`](https://github.com/rust-lang-nursery/rustfmt) to enforce a
consistent code style across the whole code base.

You can install the latest version of `rustfmt` with this command:

```
$ cargo install -f rustfmt-nightly
```

Ensure that `~/.cargo/bin` is on your path.

Once that is taken care of, you can (re)format all code by running this command:

```
$ cargo fmt
```

The code style is described in the `rustfmt.toml` file in top level of the repo.